Yes, Light Brahmas (they aren't called "White", they're Light -- Columbian, actually, with the black collars and tails (white would be pure white)), Dark Brahmas, and Buff Brahmas (the common hatchery varieties), are all Brahmas.
But if I ordered Light I have the right to expect Light.
If I ordered Dark I have the right to expect Dark.
If I ordered Buff I have the right to expect Dark.
Unless, that is, I checked the box on the order form that allows for substitution of similar breeds (which I wouldn't in most cases). If that box was checked on your order (or if you didn't uncheck it if it's "opt-out" rather than "opt-in" for that particular hatchery), then they do have the right to substitute one kind of Brahma for another.
But if I ordered Light I have the right to expect Light.
If I ordered Dark I have the right to expect Dark.
If I ordered Buff I have the right to expect Dark.
Unless, that is, I checked the box on the order form that allows for substitution of similar breeds (which I wouldn't in most cases). If that box was checked on your order (or if you didn't uncheck it if it's "opt-out" rather than "opt-in" for that particular hatchery), then they do have the right to substitute one kind of Brahma for another.